Screw-driver.



Patented Feb. 22, 1910.

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JAMES L. DUNNING, OF CLAYTON, TISSOURI.

SCREW-DRIVER.

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Specification of Letters Patent.

patented Feb. 22, 1910.

Application led .Tune 5, 1909. Serial No. 500,258.

fo all r11/tom 'it may concern.'

Be it known that I, JAMES L. DUNNING, a citizen of the United States,and resident of Clayton, llissouri,l have invented certain new anduseful Improvements in Screw- Drivers, of which the following is aspecification.

My invention relates to improvements in screw-drivers.

The object of my invention is to construct a screw-driver having a meansfor supporting a screw preparatory to applying the same in the articleand for .readily removing the tool from the screw after the same hasbeen set, then bringing the driving end of the tool in contact with thehead of the screw for inserting the screw in the article.

In the drawings-Figure 1 is a central sectional view of my completeinvention. Fig. 2 is an enlarged detail sectional View of the clutch.Fig. 3 is a detail perspective view of the end of the tube made use ofand in which is inserted a stop. Fig. 4 is a detail perspective view ofthe stop made use of. Fig. 5 is a detail perspective view of theadjusting sleeve. Fig. 6 is a plan view of the adjusting sleeve made useof in carrying out my invention. Fig. 7 is an end View of the tubeshowing the stop in position. Fig. 8 is a view of a portion of the toolshank showing the same when supported in a hand handle.

In the construction of my invention I provide a screw-driver consistingof a shank 9, its driving end provided with a flattened portion 10 andthe driving point 11. This shank is supported in a tube 12 and a toolsleeve 13. The tool sleeve 13 is provided with a head 14, its peripherybeing screwthreaded, said screw-threads meshing with a correspondinginternal screw-thread formed on the adjusting sleeve 15. The centerportion of the outer surface of the adjusting sleeve is knurled asindicated by the numeral 16 and the ends of said sleeve are externallyscrew-threaded, on which are inserted the caps 17 and 18. rlhe cap 18 isfor the purpose of limiting the movement of the head 14 when theadjusting sleeve is manipulated.

The tube 12 is provided with a flange 19 which is somewhat smaller indiameter than the opening in the sleeve and said flange contacts withthe inner surface of the cap 17 and is thereby held in position. Betweenthe head 14 and flange 19 and within the adjusting sleeve and encirclingthe shank 9 is a spring 20, the object of this spring 20 being to governthe movement of the tube 12. The'tube 12 has its end 21 provided withrecesses 22 in which are inserted flanges 23 of the s-op 24. The stop 24is provided with a central elongated opening 25 through which theflattened portion 10 of the tool passes and the purpose of the flanges23 is to prevent the stop from turning, thereby retaining the tool inposition.

On the end 21 of the tube 12 is placed a clutch 26 on the inner surfaceof which is formed a flange 27 which contacts with the stop 24,retaining the same in position against the end of the tube 12. Theclutch 26 is also provided with a slot 28'of sufficient size to admitthe insertion of various sizes of screws and in the body of the clutchand formed at right angles to the slot 29 is an elongated opening 29which is of sufficient size to admit the heads of the screws. The frontsurface or contacting edge of the clutch has two countersunk surfaces 30and 31, the surface 30 located on the interior and with which contactsthe head of the screw when the same is in a position as shown by dottedlines in Fig. 1, and the object of the counter` sunk surface 31 is topermit the tool to be placed over the head of the screw in the positionas shown by dotted lines in F ig. 2 and thereby act as a guide andpermit the driving point to lodge within the slot formed in the1 screwhead by the mere turning of the too 1When it is desired to insert thescrew into the clutch preparatory to setting the screw in the article,the op-erator manipulates the adjusting sleeve, causing the head 14 ofthe tool. sleeve to Contact with the cap 18, thereby permitting the tube12, together with the clutch and parts to move forward so that thedriving point 11 of the tool is on a line flush with the end of thetube. The screw is then inserted into the clutch and by again operatsing the adjusting sleeve in an opposite direction, the tool is broughtforward so that the driving end contacts with the head of the screw,thereby binding it against the countersunk surface 30 by the contactingof the driving end 11. After the screw has been set, the operator byoperating the adjusting sleeve removes the tool from the screw and thenby bringing the outer countersunk surface 31 in contact with the screwhead and by pressing forward on the clutch, the spring iooA l l. (l

is permitted to compress and the tool advances forward so that thedriving edge automatically seats itself in the slot of the screw headand by the tension of the spring which retains the clutch in Contactwith the head, it will prevent the tool from leaving the screw even ifthe driving head should leave the slot.

Should for any reason the operator desire to project the driving` headbeyond the contacting surface of the clutch, this can be accomplished bydrawing the tube rearwardly, compressing the spring and permitting theflattened portion to operate through the slot 25 of the stop and projecta suitable distance, this distance being regulated by means of theshoulder 32 formed on the shank 9, which shoulder comesv in Contact withthe stop 24.

The tool as shown in F ig. l has been designed for the purpose ofinserting the same into a brace indicated by dotted lines 33, and in Fig. 8 I show the same tool inserted in a hand handle, indicated bydotted lines 34. The tool sleeve 13 is held in its rigid and adjustedposition on the shank by means of the set screw 35 and by means of thisscrew the entire device is supported 1n position on the screw-driver.

Having fully described my invention7 what I claim as new and desire tohave secured to me by the grant of Letters Patent, is:

A. screw driver comprising a driving tool in combination with a set toolsleeve; a slid ing sleeve mounted on the driving tool; an

JAMES L. DUNNING.

fitnesses ALFRED A. Eioiis, WALTER C. STEIN.

